flutter - Flutter - 在底部导航栏项目单击上打开模态底部表
问题描述
如何从底部导航栏项目单击打开底部工作表。这是我当前的页面代码,这是我迄今为止尝试过的,但它似乎不起作用。我已经成功创建了底部导航栏,并且使用了 Page1()、Page2()、Page3() 功能,我可以成功迁移到其他页面,现在我需要第四个项目来打开一个底部工作表,我可以在其中做更多项目. 函数 showBottomSheet() 应该能够打开底部工作表
class _MyNavigationBarState extends State<MyNavigationBar > {
int _currentTabIndex = 0;
@override
Widget build(BuildContext context) {
final _kTabPages = <Widget>[
Page1(),
Page2(),
Page3(),
showBottomSheet()
];
final _kBottmonNavBarItems = <BottomNavigationBarItem>[
const BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
const BottomNavigationBarItem(icon: Icon(Icons.network_cell), label: 'Prices'),
const BottomNavigationBarItem(icon: Icon(Icons.add_circle), label: 'Trade'),
const BottomNavigationBarItem(icon: Icon(Icons.account_balance_wallet), label: 'Wallet'),
];
assert(_kTabPages.length == _kBottmonNavBarItems.length);
final bottomNavBar = BottomNavigationBar(
items: _kBottmonNavBarItems,
currentIndex: _currentTabIndex,
type: BottomNavigationBarType.fixed,
onTap: (int index) {
setState(() {
_currentTabIndex = index;
});
},
);
return Scaffold(
body: _kTabPages[_currentTabIndex],
bottomNavigationBar: bottomNavBar,
),
);
}
}
showBottomSheet(){
Container _buildBottomSheet(BuildContext context) {
return Container(
height: 300,
padding: const EdgeInsets.all(8.0),
decoration: BoxDecoration(
border: Border.all(color: Colors.blue, width: 2.0),
borderRadius: BorderRadius.circular(8.0),
),
child: ListView(
children: <Widget>[
const ListTile(title: Text('Bottom sheet')),
const TextField(
keyboardType: TextInputType.number,
decoration: InputDecoration(
border: OutlineInputBorder(),
icon: Icon(Icons.attach_money),
labelText: 'Enter an integer',
),
),
Container(
alignment: Alignment.center,
child: ElevatedButton.icon(
icon: const Icon(Icons.save),
label: const Text('Save and close'),
onPressed: () => Navigator.pop(context),
),
)
],
),
);
}
}
解决方案
像这样实现
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _selectedIndex = 0;
static const TextStyle optionStyle = TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
static const List<Widget> _widgetOptions = <Widget>[
Text(
'Index 0: Home',
style: optionStyle,
),
Text(
'Index 1: Business',
style: optionStyle,
),
Text(
'Index 2: School',
style: optionStyle,
),
Text(
'Index 3: Settings',
style: optionStyle,
),
];
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
showModalBottomSheet<void>(
context: context,
builder: (BuildContext context) {
return Container(
height: 200,
color: Colors.amber,
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text('BottomSheet $index'),
ElevatedButton(
child: Text('Close BottomSheet $index'),
onPressed: () => Navigator.pop(context),
)
],
),
),
);
},
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('BottomNavigationBar Sample'),
),
body: Center(
child: _widgetOptions.elementAt(_selectedIndex),
),
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home),
label: 'Home',
backgroundColor: Colors.red,
),
BottomNavigationBarItem(
icon: Icon(Icons.business),
label: 'Business',
backgroundColor: Colors.green,
),
BottomNavigationBarItem(
icon: Icon(Icons.school),
label: 'School',
backgroundColor: Colors.purple,
),
BottomNavigationBarItem(
icon: Icon(Icons.settings),
label: 'Settings',
backgroundColor: Colors.pink,
),
],
currentIndex: _selectedIndex,
selectedItemColor: Colors.amber[800],
onTap: _onItemTapped,
),
);
}
}
推荐阅读
- android - 我如何处理 MVI 架构中的两种方式绑定?
- javascript - 请问我该如何在 React native 中处理这个错误?
- python - 将 varchar 值“0.0”转换为数据类型 int.DB-Lib 时转换失败
- vb.net - 这段代码“SomeString”和“”=“”的目的是什么
- python - 模拟任务,我坚持产生正确的输出
- javascript - 从 API 获取数据的最佳方式
- jenkins - 2 个 Jenkins 实例可以使用相同的代理(又名奴隶)吗?
- php - DateTime::createFromFormat 没有按预期工作?
- python - 从 df_a 中的特定行,计算过去一年在 df_b 中的出现次数
- node.js - 缺少上传到 Firebase 存储的图像(使用云功能更新 Firestore 数据库)